Hi Jen,

Thanks for reporting this bug. I consulted with Britt (our specimen expert) and opened:
https://www.labkey.org/issues/home/Developer/issues/details.view?issueId=12738

In summary:

Today's behavior:
The request you have chosen most recently in the "Request Vial" popup is provided as the default request when you next reach the "Request Vial" popup (i.e., when you select a vial and click "Request Options -> Add to existing request"). This pattern is tracked on a per-user basis.

Desired behavior:
When you create a new request, LabKey should show this new request as the default request in the "Request Vials" popup. This behavior should persist until you select a different request in a "Request Vials" popup, or until you create a new request. At that point, the newly chosen or created request should become the default. This pattern should also be tracked on a per-user basis.

Regards,
Elizabeth